Heater fan



FIG. 1 is a perspective view of a heater fan showing my new design;

FIG. 2 is an enlarged front elevation view thereof;

FIG. 3 is an enlarged right side elevation view thereof, the left side being a mirror image of that shown;

FIG. 4 is an enlarged top plan view thereof;

FIG. 5 is an enlarged bottom plan view thereof; and

FIG. 6 is an enlarged rear elevation view thereof. 

The ornamental design for a heater fan, as shown and described. 